It’s about as easy as not dropping a trollbait topic in General - you just don’t do it.
You seem to traditionally have a problem with that though.
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It’s no different than avoiding any other game activity (dungeons, raids, pvp, etc) - just say no/not interested. Given how I mog my toons, I used to get all sorts of… interesting whispers at random, on both factions, up until MoP. However, I never actually engaged in anything.
I don’t think it’s as abundant as some claim. The whispers started dying gradually after MoP to near non-existence. Any that do come through are more tame/respectable. On occasion, I’ll hop on a toon in an s-mog and run into GS to see if I’ll get any response. It has been quiet so far… 
Don’t bother with going to Goldshire. In my years of playing on Moonguard as female toons I’ve never received a sexually explicit message from anyone outside of my friends circle as a gaff.
I’ve played multiple female characters on MG for years and years.
I’ve gotten maybe one whisper. One. So… I don’t know what you’re doing to attract the creepers.
What I did with that one whisper was wondrous, though. 
Pull your pants up?
Alliance on Moonguard know that Goldshire is for pervs, tourist, and weirdos; the rp in the bars up in SW are where to go